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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe046e728c95ba58a3d8419ff76b6dd8a128a5574519927c9826dea2986d4b13' 
  AND token = 'Gcdoh/g6pts9EhpFnCI9G3IETO/OutnFHltS3xzhkDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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