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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4035d144a2c97e5757600d1de0b25246e7f487e2ba9cfa07f7be5ec98b89ee8' 
  AND token = '+wjQvjEjuwo2xf1s8ujygCN8hgOzgwNyTgm33+uxXDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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