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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a372225142f525262c22eff9053b8f54a363df7e483ce4a1765c3c2bfc60a875' 
  AND token = 'Yg1fy2rMsw0K8W9sYgmUK8T2cUgFQ8Im1ddqbsv0cJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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