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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2febd383da749413fd5ff0881b4326fe3d5c30cdfafe1d07e44c39e1f1d18d7' 
  AND token = 'Q5ykS3t9Yyycx+X9jqCxk46M6F3grBQYcNCwyC1t0+w=' 
  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"
    }
  }
}