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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19c9ecf0699a515c6e52f4f872a415a380de5c63f8bff4f36691305025b68f7' 
  AND token = 'wX8188/KIx/uB3auwSaE33g3UazAluw9D+KH3Ao6Cz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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