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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7189740908d0e783dbb230b702469cbe9bd6282052cb636ca8e2a494b3b57b4' 
  AND token = 'JiV087nlPG+vPo/wMTFFhQ16q8EHy9EfgcAB478iam4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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