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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48392b5a24087c1b469a09ebf2a344c9405158d1f58b66ef372f336c6bd644d4' 
  AND token = '65QBmiWWmxsilnGtnwdWJE9UUrUy1d3II2XrrQdTF2g=' 
  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"
    }
  }
}