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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47074917869e0b1126fe5f238ea807bc8b205737e77bf03618508b1192ffeb5c' 
  AND token = 'iUwdib+ZKSp2AKvyy0tjbbJy0+gRLwCJx2vJjvwtSz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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