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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd139197084765c557873dd498839a3f0d33950e7b1a94e9a35f8a3d2b4504d' 
  AND token = '9RQxEIoFxtrh7IHHbyrVNozv9YSywCickyiPlKou7iY=' 
  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"
    }
  }
}