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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e43c4c53e161167515dad1ade1d0a3dbe121537496872725baf41cbfce6b831' 
  AND token = 'Mgx0NtQhbW1t23F0neJW5qPAbZi6xfDqtT+zLOK764w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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