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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a82d4b54508f5cb2071129100f03765842de5b74a9189070e21d073c93dae03' 
  AND token = 'sdH6Ds7cTy50a8i6zfQx3zEg4No5nj+IBYD9bdQUhw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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