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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8385c672c53c2d22ff0adcc612ea620c5d656f0066636fab5ad712e18e7a963c' 
  AND token = 'gwnQDFTR7bxbz8vc6Spi09T6PGX9vo9FdfpkFd/YQ0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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