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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b73e36876240800e17421c244c6e81524c8c24e798fde6764e74116fe6f706b' 
  AND token = 'xXe8wO3E1XetRamvI1VaX4MKhKJw4rt/KaiESd4X4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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