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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e991d0dc1515cd411cb6dc7903b8a26d1fa504a0ed754987a5802d50e8f1216' 
  AND token = 'Gv+DhL7/6pT77TrkNbaI24l0G6j2G8K70zAUTh83mRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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