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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0b6bde138f1e89dcbb3b9eb4a651bb63a47e5a9836d7aca1078f3c0653307c' 
  AND token = 'QrL8Uju/ymf0j0wRq4lckFOt/t7VYhVHB0zw4k1Bw3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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