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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6659eed6e34c6020b6af56dae59e4beedc49857d5d60767ae855e7b56071eff0' 
  AND token = 'u9mPpZwaQj+nuz+9U26CS6gGZ/aPLJ5ESMOnZHPA6ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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