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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76090bd92ab4d5e1d0ec1c6b796c7d5f87f18d929891171ac890cc65f8cc2e3' 
  AND token = 'Uwk4L2iXV6UpdugB7Sobb6Qk1Zcc3XKby8uDMKjY1S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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