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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fea5f5a581fe723a5822d62ff0c6db9e0a5b13849205ce6495a33876aa2335' 
  AND token = 'n5v8q3U66OXNkcDvCGYSAHYqXlywmkL5w/Ok1RBpTX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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