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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ef0f2033eec16f2608a16831fefffff2eafb9fcf95fde4e15834f7397fb9a3' 
  AND token = 'BP5I2aJ+pmke/phwVdaB+GDwlEMqjJKD0KTkNaHilMs=' 
  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"
    }
  }
}