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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098898c0412cda8a9b2b51ac025dbf55dbfbff838a833b9f4a4067666fdf6f4d' 
  AND token = 'Kts1o3fG96+1XHwqx8ahVTuJ71PugCCNKn1UxEsa2Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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