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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ec00e935ec31c6695386590db440e8f2e322fd3158befe7ba4d83066349854' 
  AND token = '+3tWZ57hAUKbkkeABhbKE87APCYOZ3PIqQ+0hl/6kT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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