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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e0e3cefc65a6d294552a80a122ed291fac1fc2fbe00dfed19987093a34f917' 
  AND token = '1eXTRHkz1GR5cyBjbsChzXXFdXLT5gj9A22HhIpsF30=' 
  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"
    }
  }
}