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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98c48134ac847d9410d1641176e199cbbf81a9a0bab6b38f5e1a0398e2d4655' 
  AND token = 'Whl+lU2zegZK8D1f5osFXp26dcx3tci8x7PCHnJbx48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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