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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0a8b825f4836a6b62059d3e0f1f3d363baae5936f142adadf995aed15e858b' 
  AND token = 'VWWzjwM+Y02PibwfQzZbzDbSclV64dT3+5weaqVEc3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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