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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ea16d22871643443f67cc7b78b3b58c3d492ce7238cb4976c74ba6089b6e8c' 
  AND token = 'pOrIYF+NiuJvO0U9Lipply26f12BO//QaZ/Sam7+p6Y=' 
  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"
    }
  }
}