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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23151050a86f60ac273d46b27e3e17abbe65936ad6e49b52ad503b137f84fbe4' 
  AND token = 'fVqCCXiBA2t3EN4VsrWyUsOSHqXH8m6ILvpZUs/bFrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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