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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab20e79f94b21415c1f9cc1f5db148f13e9df0ca382771105b6dfd5f203f44c9' 
  AND token = 'gaLeFaNv43HYox0y0PIgJkCYyC430bN65oCEd4KxHFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}