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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc352b4c83f827cfb64971b750e3a3e044c7abc64fb0860965b5873b54d6bea' 
  AND token = 'wrhWd8QH/iXIIZWCiKAXsL6HO2+iKt1AiV6rRn8Mvj4=' 
  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"
    }
  }
}