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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fcc6e921c860227609fbc5d11cb50187b920cf389273f1e1f105ad3417d883' 
  AND token = 'edEVOFj/GKxay6NNGs5YgRolSr9zHXu9E33naOe3zg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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