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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86f62c4d11550c1cc0b4e92c205c3e7ade6dd8b2c9d4ff8b2d11ffde8e7ce96' 
  AND token = '2eWgFZrQ7gSNymleBQe5oYkoKsA9qWfHj1q6RQHEjNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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