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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5988024c5cd10ec90b368b1e824a0726a0ca0aa735dea1a616520f7992b10e' 
  AND token = 'okehRs2zqe2Zi43RLxfuM+1zyInVfVNEheu7C9GTojI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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