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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8f991d9048292d03aab2a4abf7fa91902fdd3b5874f4773a5a079c3b7aac88' 
  AND token = 'SBUYcJCx1oFxvt1eKoCRd2D97U5HHz9jyDhsIHsVg0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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