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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9db44cc83eda6556cfac51987265e30eca7d9397758d2efe774ef3a34ac3cb' 
  AND token = 'dclwJK3lSxiDAopCpBDNZm8z12Tup1kyLOZ/m8WZmDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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