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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791b935b7a4de18db85d25d66b94c4a98a57d9bf39093048d6dbf14b340c0ed3' 
  AND token = '5mdlmKMipy9AXD4ncGYGUfzATJCslK+Yq7Ndx5rYEi4=' 
  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"
    }
  }
}