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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5ce5b59635c229687e48b5e749c856b3ac409fa6a6513b340bbece8f1f9ffe' 
  AND token = '3M8oGVcl8StE2AuXOnqXH09r2Gbfsp7RYmqt9Wfklio=' 
  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"
    }
  }
}