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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a757dd8fd4d4cc31e4a35629f508ed12e1ad5d6f35e8b524c20cdb0ac5b36a' 
  AND token = 'Dq9i2ldjTtjQ8H03nI3LmcCdBa+fSiEIC6m5PaooCms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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