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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee4c18fa960cfd7624384e23c5a5c245fd5786764db201dc49a83d70ecdaa56' 
  AND token = 'Umu8e89iawtZts+RBtCM6d6cN9ApoKqQ5ZJuAZWM0sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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