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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8012434da1f3b2115f566f27498375cc1804cbe819ee7173d10c388ef82905' 
  AND token = 'kr17J5FA57g1ba1wwtwD21I3Z9xTBUfJ6BXCf6L/VXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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