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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452301e94eea795f595ec088a2a64d9b3cc2e63e668e3134eb8908ef53f6e071' 
  AND token = 'K4dA96a/brEWPNY4FqaPR7s21Knl8Vn6Pwi50kl3q24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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