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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050ece6694b853f5f2491777fb291b05e228180c1f1cddd09292e31c151cafec' 
  AND token = 'HsU3P9bSHZ0jnzHzzxHKhJch5qAKufATpUl5bbwYeDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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