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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524085e89b8743e4ab7217e6e3826bab0fd3f153d52ce15717edc7a7b0331834' 
  AND token = 'nMdLlQEgkRJvp89v9Zf5JeWB/2xVz/eXqqDNM4DKR58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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