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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c2628909977bc95f7c685d3ce7de563db521013d1e023b3e5ac2ce82a972f1' 
  AND token = '6AZBgr9wxdEiPqaILg7bb6dWLjMC7PWzjEKThH12TYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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