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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33d3d6a2c32316dcd90cca6ad1153dc0558304169f09ae1ed0eaac3b67d760e' 
  AND token = 'vY74qGF7tHogz69D0GMKdf/i/Q+BHxjOuEKMSniADxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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