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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2996f7b10760c581b136a8aab14b6e3b24bdfe43174718ec908bf2325204b960' 
  AND token = 'V9VaNnFb+i5iHpenh5kBXclPTswzlhc4cSBzYMTg/V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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