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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0b674eede0c8ab52d6cc007330c7d9cf2753ccda838fed137a313a9a3c1cd6' 
  AND token = 'wjbiYman1K/06M2yYTIHU5PDrMaZmkYJhKM1bvyD0sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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